The other arm is a pre-treatment arm where participants will receive a split loading dose regimen with 30 mg of prasugrel administered immediately after NSTEMI diagnosis and prior to diagnostic coronary angiography. The remainder of the loading dose (30 mg) will be administered when the participants are proceeding to PCI. Subsequently, participants will receive daily maintenance doses of prasugrel until day 30. Participants who are greater than or equal to 75 years of age or who have a body weight less than 60 kg will receive 5 mg oral dose daily. All others will receive a 10 mg oral daily maintenance dose for 30 days.